why always seeing sell order more than buy order when goes up ?

Announcing Ycash, The First "Friendly Fork" of the Zcash Blockchain: https://forum.zcashcommunity.com/t/announcing-ycash-the-first-friendly-fork-of-the-zcash-blockchain/33162

Is there a specific exchange or wallet you must hold your Zec to receive some precious Y

You'll need to be in possession of your private keys. No exchange support should be assumed.